Talk to the good techs at the dealers and Indy shops--the wiring harnesses are crap and the individual wire insulation inside the black sheath turns to powder (bio-degradable).

Low voltage scrambles a lot of things and is the first fix required.

Then pray a lot, don't TOUCH the harnesses, much less flex them--or be prepared for lots of glitches until finally you replace the things out of desperation. Sobbering to think of 2-4 harnesses @$500-1000 each, plus 4-20 hrs each to replace them. +electronic throttle actuators (2 on the 12 cyl engines@ $2500 each)

I inquired about why NTHSA has not ordered a recall. Seems they have not heard about any accidents caused by this--the engine does not stop==it just goes into limp in mode and 'allows you to pull out of traffinc safely.' Wonder who MBZ took out to the bars and whereever to get that friendly analysis.